The Riedel OUVERTURE series wine glasses were introduced in 1989 and are considered the elementary entry level Riedel series for customers who appreciate good, reasonably priced wine. Riedel OUVERTURE series wine glasses are a non varietal specific collection of ten lead-free glasses designed to increase the casual wine drinker’s pleasure of wine, beer and spirits. Riedel OUVERTURE series wine glasses are machine blown in Bavaria Germany. They are dishwasher safe, but hand-washing is recommended for all fine Riedel glassware.